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Mbete provided a detailed explanation for her decision at a media briefing on Monday afternoon‚ quoting at length from the June Constitutional Court judgment granting her the discretion to decide on the voting method.

By delaying the announcement until the eleventh hour‚ it was expected that she would opt for the open ballot and was trying to narrow the time available for an urgent court challenge by opposition parties.

But Mbete stunned the country when she said she had taken “due and impartial consideration of all the factors” and decided that voting on the motion would be by secret ballot.

It was significant also that she mentioned that a secret ballot became necessary when “circumstances are toxic” — in reference to the threats and bullying directed at ANC MPs who indicated they would vote according to conscience.

Mbete’s decision and her justification also show that she is concerned about her own political fate and remains in contention for a top position in the ANC’s national elective conference — without Zuma’s help.

Even with the secret ballot‚ the numbers still weigh in favour of Zuma remaining president‚ but the number of people who vote in support of the motion will reveal his support within the ANC.

The motion requires a simple majority, at least 201 members, in favour to succeed. Of the 400-member National Assembly opposition parties jointly hold 151 seats in the National Assembly. Presuming there is full attendance‚ 50 ANC members would need to vote to support the motion tabled by Democratic Alliance leader Mmusi Maimane.

While there is a three-line whip for the debate‚ there could however be absentees due to illness and overseas travel and there are two ANC MPs who have died‚ which could affect the outcome.

For those ANC MPs worried about supporting an opposition motion‚ they now have the option to abstain — meaning that the ruling party will not have the absolute majority in support of Zuma as in previous cases.

Therefore‚ any number higher than 155 votes in support of the motion means that ANC MPs have defied the party instruction.

Zuma may or may not survive but based on Mbete’s decision and depending on the number of ANC MPs who vote according to conscience‚ it is clear that more and more people are no longer prepared to throw themselves under the bus to save him.